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Figure 4 The time course of the serum erythropoietin (EPO) levels in an additional study in which 18 patients with acute myocardial infarction (MI) who satisfied the inclusion criteria of the present study were investigated. The blood sampling was performed soon after the primary percutaneous coronary intervention, and 24 h, 48 h, and 14 days after the onset of acute MI. Two-way analysis of variance with repeated measures revealed that the serum EPO level during the 14 days was significantly higher in the patients with an initial serum EPO level >20.3 mU/ml (n = 10) than in those with an initial serum EPO level <20.3 mU/ml (n = 8, p = 0.001). The interaction between the difference in the initial serum EPO levels and the time course of the serum EPO level was not statistically significant (p = 0.21). Mean ± SD. Solid triangles = initial EPO <20.3 mU/ml; open circles = initial EPO >20.3 mU/ml.
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